Flight Simulator X Build

My understanding is the Flight Sim X was highly cpu dependant, I could be wrong. Don't get that powersupply. Get a good quality one from PC power and cooling, antec, or the like. A bad powersupply could destroy all of your components. You sacrificed a lot of components to get that graphics card. A more balanced system should have a low end core2duo that can be overclocked. Your previous computer has a better cpu. You can't just compare clock speeds. For the clock, a Core2duo is better than a pentium.

Greg the Pentium e5400 should be quite a bit faster then the e4400 at stock speeds (all the specs are better are they not)?

I'll also say it again, I will not be overclocking this build. So if you have a better CPU suggestion I would be interested in it based on its stock performance, not potential performance after overclocking

As far as the PSU goes, what would you suggest instead? If I extend the budget an additional $15 leaving $50 for the PSU?

There ya go.

http://cmstore.coolermaster-usa.co [...] ucts_id=83 $19.99
Centurion 5 Black w/Silver Trims ATX Mid Tower, W/O window, W/O PSU - Refurbished

http://www.newegg.com/Product/Prod [...] 6817341021 $59.99
OCZ Fatal1ty OCZ400FTY 400W ATX12V / EPS12V Active PFC Power Supply - Retail

http://www.newegg.com/Product/Prod [...] 6813128380 $84.99
GIGABYTE GA-EP43-UD3L LGA 775 Intel P43 ATX Intel Motherboard - Retail

http://www.newegg.com/Product/Prod [...] 6819115206 $119.99 Free Shipping*
Intel Core 2 Duo E7400 Wolfdale 2.8GHz 3MB L2 Cache LGA 775 65W Dual-Core Processor - Retail

http://www.newegg.com/Product/Prod [...] 6814127421 $159.99 ($144.99 after $15.00 Mail-In Rebate)
MSI N250GTS-2D1G-OC GeForce GTS 250 1GB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready Video Card - Retail
Free Call of Duty: World at War w/ purchase, limited offer(

http://www.newegg.com/Product/Prod [...] 6820231122 $39.99 Free Shipping*
G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Retail

http://www.newegg.com/Product/Prod [...] 6822136074 $54.99 Free Shipping*
Western Digital Caviar SE16 WD3200AAKS 320GB 7200 RPM 16MB Cache SATA 3.0Gb/s Hard Drive - OEM

http://www.newegg.com/Product/Prod [...] 6827136152 $24.99 Free Shipping*
LG Black 22X (CAV) DVD+R 8X DVD+RW 16X DVD+R DL 22X (CAV) DVD-R 6X DVD-RW 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2MB Cache SATA 22X DVD±R DVD Burner - OEM

Total: $564.92 *(not including shipping and rebates)

With the 512 mb version.

http://www.newegg.com/Product/Prod [...] 6814130468 $139.99
EVGA 512-P3-1150-TR GeForce GTS 250 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Retail
Free Call of Duty: World at War w/ purchase, limited offer

Total: $522.92

http://techgage.com/article/evga_g [...] erclocked/ <=== test results for the gts 250 1 gig

http://techreport.com/articles.x/16504 <=== more test results

http://www.legitreviews.com/article/913/1/ <=== more test results

http://www.ninjalane.com/reviews/video/palit_gts250 <=== more test results

For a flight simulator you really want to go with a quad core if you can swing it. You might be better off following knotknut's advice with the budget you have.

Have you seen the THG review of FS at:

http://www.tomshardware.com/review [...] 28-10.html

The review is a year old so it does not have the latest cpu and graphics cards, however it shows various video cards and processors - with some overclocks as well. What it seems to show is that, with respect to Intel processors, the speed of the processors is more important then whether it has two or four cores. Extrapolating from this, I would recommend going with a faster E7400 over a slower Q8200.
It also confirms that for FS the cpu choice is relatively more important than the GPU compared to other game choices. It appears that 9600 GT should give excellent results when paired with the faster CPU - and some are on sale now for $70. You might want to consider a GS 250 which is a little faster than all of the ones on the year old review since it is based on the 9800GTX+, although you will pay $100-130 for what might be a small advantage.
The review also shows the impact of overclocking the CPU. While I understand this does not interest you at this time, you might consider the benefits to be gained by simple OC of the FSB ratio to increase processor speed.
Finally, you did not state what resolution and AA and AF settings you wish to use, which also makes a difference.